The girls of the Karasuma Phoniatric Clinic visit Hibiki's family in the country. While wandering the countryside, the girls' friendship grows deeper as they learn more about Hibiki's past and the reason they each became healers.

The three apprentices of Ria Karasuma are about to become true healer-sisters, but as the test approaches, they can no longer sing harmoniously. Ria therefore offers to send them to a training course, under the benevolent supervision of Aoi.